IPhone 4S when I remove sim it says invalid sim

I took out my SIM card and it says invalid sim when it out of the phone. It should say no sim so why is it doing this

There's a problem with your phone then.

Back it up, and then try restoring it. If the problem still occurs, take it to Apple, phone Apple, or return it to the store you got the phone from if it wasn't Apple.

I Phone only works with a sim inserted

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